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适用范围：<p>When preparing construction, project, and program cost estimates, it is often necessary to make monetary provision for change or risk, or both, or other exigencies where information is incomplete.</p> <p>Such allowance, contingency or reserve sums are employed by many persons engaged in the planning, delivery, and financing of construction work.</p> <p>These users include owners, developers, facilities programmers, cost planners, estimators, schedules, architects and engineers, specification writers, operating and maintenance staff, manufacturers, educators, financial managers, and comptrollers.</p><p id="s00002">1.1 This classification establishes a classification for allowance, contingency, and reserve sums used in construction, project, and program estimating.</p> <p id="s00003">1.2 This classification applies to all construction work.</p> <p id="s00004">1.3 This classification is not based on permanent physical elements of construction (as defined and classified in Classification <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?E1557-HTML">E1557</a>). Rather, the classification items are cost components common to construction, project, and program estimates.</p>